21276125 has 16 divisors (see below), whose sum is σ = 28597296. Its totient is φ = 15710400.

The previous prime is 21276121. The next prime is 21276131. The reversal of 21276125 is 52167212.

It can be written as a sum of positive squares in 8 ways, for example, as 6120676 + 15155449 = 2474^2 + 3893^2 .

It is not a de Polignac number, because 21276125 - 2² = 21276121 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21276094 and 21276103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4922 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (1787331).

Almost surely, 2^21276125 is an apocalyptic number.

21276125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21276125 is a deficient number, since it is larger than the sum of its proper divisors (7321171).

21276125 is a wasteful number, since it uses less digits than its factorization.

21276125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13121 (or 13111 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21276125 is about 4612.6050123547. The cubic root of 21276125 is about 277.0963750371.

The spelling of 21276125 in words is "twenty-one million, two hundred seventy-six thousand, one hundred twenty-five".